Electrically heated tool



Sept. 29, 1942. E. M. HOLM ELECTRICALLY HEATED TOOL Filed Feb. 26, 1942 s Sheets-Sheet 1 Invent/1r Edd zkMZZ M Sept. 29, 1942. I E. M. HOLM 2,297,103

ELECTRICALLY HEATED TOOL Filed Feb. 26, 1942 s Sheets-Sheet 2 W ame):

Patented Sept. 29, 1942 UNITED STATES PATENT OFFICE ELECTRICALLY HEATED TOOL I Eddie M. Holm, Moor-head, Minn. Application February 26, 1942, Serial No. 432,522

1 Claim.

This invention relates to new and useful improvements in tools such as are used in removing putty and sealing materials from various structures, the principal object of the invention being to provide an electrically heated tool which will greatly assist in removing the material being worked.

Another important object of the invention is to provide a tool of the character stated which can be easily demounted for the purpose of repair or replacement of parts.

Other objects and advantages of the invention will become apparent to the reader of the following description. 1

In the drawings:

Figure 1 represents a longitudinal sectional view through the box part of the tool.

Figure 2 is a longitudinal sectional view taken substantially on the line 22 of Figure 1.

Figure 3 is a side elevational view of the tool.

Figure 4 is a cross section on the line 4-4 of Figure 1.

Figure 5 is a perspective view of one section of the box.

Figure 6 is a perspective view of the thermal switchl Figure 7 is an edge elevational view of the tool. Figuie 8 is a fragmentary perspective and explo'dedfview showing the handle and blade structures. #1

Figure 9 is a diagrammatic view showing the electrical devices electrically connected.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the tool includes a box-like structure generally referred to by numeral 5 and made up of side sections 6, 1. These sections have side flanges a, a. and a sloping bottom wall b. Each of these sections 8, I has internal ribs 8 for the purpose of increasing the circulation of air just inside of the walls of said sections 6, I.

Elongated plates 9 are provided within the boxlike structure 5 and at opposite sides thereof and over these plates 9 overlap the flanges a of the box sections 6, 1. As suggested in Figures 4 and '7, the flanges being formed with openings ill have machine screws H disposed therethrough and into threaded openings of the plates 9.

An elongated blade H has its upper corner portions cut away as at l3 to define shoulders 14, while its lower end is reduced to provide a knife portion l5 having a cutting edge IS.

The intermediate portion of this blade l2 has a bolt opening H for receiving a bolt l8 which extends through the sections .6, 'l to material and denoted by numeral 22 are interposed between the outermost sides of the heating units 20, 2| and the sections 6, I, while plates of aluminum or some other high heat conductive material and denoted by numeral 23 are interposed oetween the units 20, 2| and the blade l2,

so as to increase the conductivity of heat from the heating unit to the blade I2 as much as possible.

As can be seen in Figure 9, current flows into one side 24 of a thermal switch generally referred to by numeral 25 and passes by way of the other side 26 by way of jumpers 21, 28 to the heating unit 20, 2|, A conductor 29 forms a return to the source of current, of course, exteriorly of the tool.

Numeral 30 denotes a U-shaped head piece for the box structure 5, the interior of which is formed with a groove 3| extending down the leg portion thereof for receiving the upper edge portion of the blade l2.

The leg portions of the head member 30 are formed with threaded openings 32 for receiving machine screws 33 which are disposed through openings in the flanges a of the sections 6, I.

A handle 35 having a bore therethrough is provided for the head 30, a bolt or tie rod 33 extending from the head 30 and longitudinally through the handle 35, this bolt being provided with a nut 31 to hold the handle 35 in firm position.

Binding posts 38, 39 equippedv with nuts, are provided on section 6 of the box structure 5, one being connected to the member 24 of the switch 25, while the other has the return wire (see Figure 9) connected thereto.

Obviously, as is suggested in Figure 5, the lower wall b of each section 6 l is reduced so as to permit the knife portion 15 of the blade l2 to project downwardly therethrough.

Obviously, this tool when heated will assist materially in loosening various sealing materials and facilities the work of removing such material quickly.

While the foregoing specification sets forth the invention in specific terms it is to be understood that numerous changes in the shape, size and mahold the box terials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.-

Having described the invention, what is claimed aanewis:

fitting in the other end at said structure and interlocking with said blade to hold the same rigid at one end thereof, a handle extending from said head, the inner side of the box-like structure be- 5 ing provided with corrugations to promote circulation of air.

end of the box-like structure, heating means in v the box for supplying heat to the blade, a head EDDIE M. HOLM. 

